Using the Formula Field
Overview
Make your form a math wiz by allowing it to perform calculations. You can total up costs, compare dates, apply discounts, use built-in functions and more!
Use the
Formula field to set up any form calculation. When your respondents fill in the form, calculations will be performed based on their input. The answer will be displayed in the field you have entered your formula in.
Using the Formula field you can,
- Perform mathematical operations such as addition, subtraction, multiplication, and division
- Use certain math functions to calculate differences between two times, dates, and more
- Set up conditional calculations to perform calculations based on the respondent's answers
Setup
To add a formula field to your form,
- Drag and drop or click the Formula field under the Advanced Fields section.
- In the pop-up, your form fields would appear in the left pane. Use the fields on the left, numbers, and mathematical operators on the right to come up with your formula.
- Click Done.
- You can choose to hide this field from your respondents using the Hide Field option under Properties.
- If you wish to edit your formula, click the Edit link under Properties.
For example, you can calculate the amount your customer has to pay using the formula field and display the amount in the payment field automatically. For this, you can set the formula as
Item * Quantity, where the
numeric value assigned for the field
Item will be taken for the calculation.
Supported Field Types for Formula
Number, Decimal, Currency, Slider, Rating, Formula, Radio, Checkbox, Multiple Choice, Dropdown, Image Choice, Date, Date-Time, Time
Note :
While using the Formula field as a variable for calculating another formula, ensure that the two formulas are not mutually dependent. If you have come across an error because two formulas are mutually dependent, then refer to the below example:
If
n1, n2, n3 are three number fields, and f1, f2, f3 are the formulas that you have created where,
f1= n1+ n2
f2= n3 + f3
f3= f1 + f2
Formula 2 depends on Formula 3's answer (and vice versa) to perform calculations, resulting in an endless loop. Recheck your formula to avoid this type of infinite loop.
Functions
Using the math functions we support, you can calculate the differences between time and date fields, and also round off decimal numbers into integers. You will find Functions in the right pane of the Formula field pop-up.
To use a function,
- Tap on the math function you wish to add.
- It generates a syntax like this: Function (Field Name - Field Name).
- Replace the field's placeholders with the required form fields by clicking them from the left pane.
Supported Math Functions
|
Function
|
Role
|
Supported Field Types
|
|
DayDiff
|
Returns the day difference between two date values
|
Date, Date-Time
|
|
MonthDiff
|
Returns the month difference between two date values
|
Date, Date-Time
|
|
YearDiff
|
Returns the year difference between two date values
|
Date, Date-Time
|
|
HourDiff
|
Returns the hour difference between two time values
|
Time, Date-Time
|
|
MinutesDiff
|
Returns the minute difference between two time values
|
Time, Date-Time
|
|
RoundUp
|
Rounds off the decimal number to that next value, away from zero
|
Decimal, Currency, Formula
|
|
RoundDown
|
Rounds off the decimal number to that of the previous value
|
Decimal, Currency, Formula
|
|
Round
|
Rounds off a decimal number to that of the next number when the decimal
value is .5 or above, and to the previous number when the decimal value is below .5 |
Decimal, Currency, Formula
|
|
Age
|
Returns the age in years from the selected date as of the current date. If the selected Date field is left blank, or if the selected date is a future date relative to the current date, the age will be taken as 0.
When calculating age, the months completed are not returned. For example, if the age calculated is 19 years and 7 months, only 19 years is returned.
|
Date, Date-Time
|
|
SelectionCount
|
Returns the number of options selected in the supported choice based field types. If a choice field (supported field) in Subform is used within the formula, this function returns the sum of all choices selected
|
Multiple Choice, Checkbox, Image Choices |
|
CurrentDate
|
This field is used to return the difference between the current date and the selected date in the
DayDiff,
MonthDiff, and
YearDiff functions
|
Date, Date-Time
|
Adding a Unit to Formula
You can add a unit to your formula to show the result more contextually in the live form. A unit can be added once the formula configuration is completed.
To include a unit for the formula calculated value, enter a suitable Unit under Properties.
You can select to position this unit either as a
Prefix or a
Suffix.
Note: If you choose to include unit to the formula calculated value in a Subform, note that the unit will be displayed only in the Subform's
Pop-up mode.
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